单项选择题

He tried ______ a new microphone and was able to make himself heard.

A. to use
B. to be used
C. to using
D. using
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单项选择题
The students are staying up late these days ______ for the final exams.
A. to preparing
B. to prepare
C. being prepared
D. prepared
单项选择题
Mary and John ______ each other since childhood.
A. have been knowing
B. knew
C. have known
D. had known
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